Evidence of long-distance movement of green sawfish (Pristis zijsron) in Western Australia

Jack Ingelbrecht, Mark G. Allen, Rebecca L. Bateman, Brendan C. Ebner, Travis Fazeldean, Kurt N. Krispyn, Karissa O. Lear, Tegan Lee, Alan J. Lymbery, Rory B. McAuley, Nicole M. Phillips, Jeff M. Whitty, Barbara E. Wueringer, David L. Morgan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Context: In this study, single-nucleotide polymorphisms (SNPs) were used to investigate kinship for the green sawfish (Pristis zijsron).

Aims: To examine the relatedness of P. zijsron across an expansive coastline in Western Australia.

Methods: Sampling was conducted between the Fitzroy River estuary and Bay of Rest in the eastern Indian Ocean (north-western Australia) between 2003 and 2022. SNPs were generated from tissues collected from 137 live and 1 recently deceased P. zijsron.

Key results: Overall, 62 individual P. zijsron were assigned to 25 litters of full siblings, with litter sizes ranging from 2 to 5 pups, and 76 P. zijsron individuals were assigned to 96 half sibling pairwise relationships. Four pairs of half siblings were captured more than 500 km and born at least 6 years apart, including one pair of neonates captured similar to 870 km and 8 years apart, in the Ashburton River estuary (Pilbara) and Cable Beach (Broome). Furthermore, a pair of full-sibling pups (i.e. young of the year) caught at Cape Keraudren (Pilbara) in 2008 were half siblings of a pup caught in the Ashburton River in 2014.

Conclusions: This study provides evidence of long-distance, likely parental, movement of P. zijsron.

Implications: Dispersal of P. zijsron over large spatial scales indicates that populations could be replenished from elsewhere should they experience a decline, thereby reducing the risk of localised extinction for this species.
Original languageEnglish
Article numberMF24154
Pages (from-to)1-7
Number of pages7
JournalMarine and Freshwater Research
Volume75
Issue number17
Early online date21 Nov 2024
DOIs
Publication statusPublished - 2024

Bibliographical note

Copyright the Author(s) 2024. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • Kimberley
  • Pedigree
  • Pilbara
  • Pristidae
  • Rhinopristiformes
  • Dispersal
  • Reproduction
  • Sibship
  • Single-nucleotide polymorphism
  • dispersal
  • sibship
  • single-nucleotide polymorphism
  • reproduction

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